使用 jq 提取特定的 属性 值并在单行上输出

Using jq to extract specific property values and output on a single line

我有这个 ElasticSearch 快照输出,我想将它减少到在一行上打印,每个 snapshot end_time_in_millissnapshot 属性 由 space:

分隔
1429609790767 snapshot_1
1429681169896 snapshot_2

基本上是

的输出

但合并在一条线上。

我正在查看 map 但不知道如何应用它;也在阅读 我试过了:

cat data  | jq '.snapshots[] | map(. |= with_entries( select( .key == ( "snapshot") ) ) )'

但这会产生很多错误和 null 输出。

数据:

{
  "snapshots": [
    {
      "shards": {
        "successful": 1,
        "failed": 0,
        "total": 1
      },
      "failures": [],
      "snapshot": "snapshot_1",
      "indices": [
        "myindex1"
      ],
      "state": "SUCCESS",
      "start_time": "2015-04-21T09:45:47.041Z",
      "start_time_in_millis": 1429609547041,
      "end_time": "2015-04-21T09:49:50.767Z",
      "end_time_in_millis": 1429609790767,
      "duration_in_millis": 243726
    },
    {
      "shards": {
        "successful": 1,
        "failed": 0,
        "total": 1
      },
      "failures": [],
      "snapshot": "snapshot_2",
      "indices": [
        "myindex1"
      ],
      "state": "SUCCESS",
      "start_time": "2015-04-22T05:36:02.333Z",
      "start_time_in_millis": 1429680962333,
      "end_time": "2015-04-22T05:39:29.896Z",
      "end_time_in_millis": 1429681169896,
      "duration_in_millis": 207563
    }
  ]
}

使用这个过滤器:

.snapshots[] | "\(.end_time_in_millis) \(.snapshot)"

这会为每个快照构建一个字符串,其中包含结束时间和快照名称。

只需确保使用 -r 选项来获取原始输出。